A trapped field of 17.6 T in melt-processed, bulk Gd-Ba-Cu-O reinforced with shrink-fit steel
John H. Durrell,Anthony R. Dennis,Jan Jaroszynski,Mark D. Ainslie,Kysen G Palmer,Yunhua Shi,A.M. Campbell,John R. Hull,M. Strasik,Eric E. Hellstrom,David A. Cardwell +10 more
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In this paper, the authors reported a trapped field of 17.6 T in a stack of two silver-doped GdBCO superconducting bulk samples, each 25 mm in diameter, fabricated by top-seeded melt growth and reinforced with shrink-fit stainless steel.Abstract:
The ability of large-grain (RE)Ba2Cu3O7−δ ((RE)BCO; RE = rare earth) bulk superconductors to trap magnetic fields is determined by their critical current. With high trapped fields, however, bulk samples are subject to a relatively large Lorentz force, and their performance is limited primarily by their tensile strength. Consequently, sample reinforcement is the key to performance improvement in these technologically important materials. In this work, we report a trapped field of 17.6 T, the largest reported to date, in a stack of two silver-doped GdBCO superconducting bulk samples, each 25 mm in diameter, fabricated by top-seeded melt growth and reinforced with shrink-fit stainless steel. This sample preparation technique has the advantage of being relatively straightforward and inexpensive to implement, and offers the prospect of easy access to portable, high magnetic fields without any requirement for a sustaining current source.read more
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References
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High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29 K
Masaru Tomita,Masato Murakami +1 more
TL;DR: A post-fabrication treatment is presented that improves the mechanical properties as well as thermal conductivity of a bulk Y-Ba-Cu-O magnet, thereby increasing its field-trapping capacity and thermal stability and internal mechanical strength.
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Flux creep in type-ii superconductors.
TL;DR: In this paper, a superconducting quantum interferometer coupled to a creep specimen by a super-conducting flux transformer was used to make measurements of the evanescent decay of the irreversible magnetization induced by magnetic cycling.
Journal ArticleDOI
Damage caused by magnetic pressure at high trapped field in quasi-permanent magnets composed of melt-textured YBaCuO superconductor
TL;DR: In this article, a mini-magnet fabricated from four melt-textured YBa2Cu3O7 - delta (MT-YBCO) discs activated at 49 K using an applied field of 14 T was observed to crack.
Journal ArticleDOI
Applications of bulk high-temperature Superconductors
J.R. Hull,Masato Murakami +1 more
TL;DR: Improvements in HTS properties, such as flux pinning, mechanical strength, and the ability to grow large grains, have greatly improved the economics of applications that use bulk HTS.
Journal ArticleDOI
Melt-processed Gd–Ba–Cu–O superconductor with trapped field of 3 T at 77 K
TL;DR: In this paper, a single-domain Gd?Ba?Cu?O bulk superconductor 65mm in diameter was fabricated and the microstructure, superconducting and field-trapping properties were studied.
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